LMP8645

ACTIVE

-2 to 42V, 990kHz, configurable gain current sense amplifier

Product details

Product type Analog output Common-mode voltage (max) (V) 42 Common-mode voltage (min) (V) -2 Input offset (±) (max) (µV) 1000 Input offset drift (±) (typ) (µV/°C) 4 Voltage gain (V/V) adjustable CMRR (min) (dB) 60 Bandwidth (kHz) 990 Supply voltage (max) (V) 12 Supply voltage (min) (V) 2.7 Iq (max) (mA) 0.61 Number of channels 1 Comparators (#) 0 Gain error (%) 2 Gain error drift (±) (max) (ppm/°C) 140 Slew rate (V/µs) 0.5 Features Low-side Capable, Programmable Gain Rating Catalog Operating temperature range (°C) -40 to 125
Product type Analog output Common-mode voltage (max) (V) 42 Common-mode voltage (min) (V) -2 Input offset (±) (max) (µV) 1000 Input offset drift (±) (typ) (µV/°C) 4 Voltage gain (V/V) adjustable CMRR (min) (dB) 60 Bandwidth (kHz) 990 Supply voltage (max) (V) 12 Supply voltage (min) (V) 2.7 Iq (max) (mA) 0.61 Number of channels 1 Comparators (#) 0 Gain error (%) 2 Gain error drift (±) (max) (ppm/°C) 140 Slew rate (V/µs) 0.5 Features Low-side Capable, Programmable Gain Rating Catalog Operating temperature range (°C) -40 to 125
SOT-23-THN (DDC) 6 8.12 mm² 2.9 x 2.8
  • Typical Values, TA = 25°C
  • High Common-Mode Voltage Range
    • LMP8645 –2 V to 42 V
    • LMP8645HV –2 V to 76 V
  • Supply Voltage Range 2.7 V to 12 V
  • Gain Configurable With a Single Resistor
  • Maximum Variable Gain Accuracy (With External Resistor) 2%
  • Transconductance 200 µA/V
  • Low Offset Voltage 1 mV
  • Input Bias 12 µA
  • PSRR 90 dB
  • CMRR 95 dB
  • Temperature Range −40°C to 125°C
  • 6-Pin SOT Package
  • Typical Values, TA = 25°C
  • High Common-Mode Voltage Range
    • LMP8645 –2 V to 42 V
    • LMP8645HV –2 V to 76 V
  • Supply Voltage Range 2.7 V to 12 V
  • Gain Configurable With a Single Resistor
  • Maximum Variable Gain Accuracy (With External Resistor) 2%
  • Transconductance 200 µA/V
  • Low Offset Voltage 1 mV
  • Input Bias 12 µA
  • PSRR 90 dB
  • CMRR 95 dB
  • Temperature Range −40°C to 125°C
  • 6-Pin SOT Package

The LMP8645 and the LMP8645HV devices are precision current sense amplifiers that detect small differential voltages across a sense resistor in the presence of high-input common-mode voltages.

Operating from a supply range of 2.7 V to 12 V, the LMP8645 accepts input signals with a common-mode voltage range of –2 V to 42 V, while the LMP8645HV accepts input signals with a common-mode voltage range of –2 V to 76 V. The LMP8645 and LMP8645HV have adjustable gain for applications where supply current and high common-mode voltage are the determining factors. The gain is configured with a single resistor, providing a high level of flexibility, as well as accuracy as low as 2% (maximum) including the gain setting resistor. The output is buffered to provide low output impedance. This high-side current sense amplifier is ideal for sensing and monitoring currents in DC or battery-powered systems, has excellent AC and DC specifications over temperature, and keeps errors in the current sense loop to a minimum. The LMP8645 is an ideal choice for industrial, automotive, and consumer applications, and is available in SOT-6 package.

The LMP8645 and the LMP8645HV devices are precision current sense amplifiers that detect small differential voltages across a sense resistor in the presence of high-input common-mode voltages.

Operating from a supply range of 2.7 V to 12 V, the LMP8645 accepts input signals with a common-mode voltage range of –2 V to 42 V, while the LMP8645HV accepts input signals with a common-mode voltage range of –2 V to 76 V. The LMP8645 and LMP8645HV have adjustable gain for applications where supply current and high common-mode voltage are the determining factors. The gain is configured with a single resistor, providing a high level of flexibility, as well as accuracy as low as 2% (maximum) including the gain setting resistor. The output is buffered to provide low output impedance. This high-side current sense amplifier is ideal for sensing and monitoring currents in DC or battery-powered systems, has excellent AC and DC specifications over temperature, and keeps errors in the current sense loop to a minimum. The LMP8645 is an ideal choice for industrial, automotive, and consumer applications, and is available in SOT-6 package.

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Technical documentation

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Type Title Date
* Data sheet LMP8645, LMP8645HV Precision High Voltage Current Sense Amplifier datasheet (Rev. H) PDF | HTML 02 May 2022
Application note Using a PCB Copper Trace as a Current-Sense Shunt Resistor PDF | HTML 25 Jan 2022
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
EVM User's guide AN-1975 LMP8640 / LMP8645 Evaluation Board User Guide (Rev. C) 26 Apr 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation model

LMP8645 PSPICE Model (Rev. A)

SNOM087A.ZIP (18 KB) - PSpice Model
Calculation tool

CS-AMPLIFIER-ERROR-TOOL Current Sense Amplifier Comparison and Error Tool

This Excel calculator provides a comparison between two and five of our standard current sense amplifiers, delivering a chart containing the basic parameters of each device. This calculator also takes system condition inputs from users such as common-mode voltage, supply voltage, shunt resistor (...)
Supported products & hardware

Supported products & hardware

Products
Analog current-sense amplifiers
INA138 2.7 to 36V, 800kHz Variable gain current sense amplifier INA138-Q1 AEC-Q100, 2.7 to 36V, 800kHz Variable gain current sense amplifier INA139 2.7 to 36V, 440kHz Variable gain current sense amplifier INA139-Q1 AEC-Q100, 2.7 to 36V, 440kHz Variable gain current sense amplifier INA168 2.7 to 60V, 800kHz Variable gain current sense amplifier INA168-Q1 AEC-Q100, 2.7 to 60V, 800kHz Variable gain current sense amplifier INA169 2.7 to 60V, 440kHz Variable gain current sense amplifier INA169-Q1 AEC-Q100, 2.7 to 60V, 440kHz Variable gain current sense amplifier INA170 2.7 to 60V, bi-directional, 400kHz Variable gain current sense amplifier INA180 26V, 350kHz current sense amplifier INA180-Q1 AEC-Q100, 26V, 350kHz current sense amplifier INA181 26-V bi-directional 350-kHz current-sense amplifier INA181-Q1 AEC-Q100, 26V, bi-directional, 350kHz current sense amplifier INA183 2.7-V to 26-V, high-precision current sense amplifier with input supply INA185 26-V, 350-kHz, bi-directional, high-precision current sense amplifier in ultra-small SOT-563 package INA186 40-V, bidirectional, high-precision current sense amplifier with picoamp input bias & ENABLE INA186-Q1 AEC-Q100, 40-V, bidirectional, high-precision current sense amplifier w/ picoamp input bias & ENABLE INA190 40-V, bidirectional, ultraprecise current sense amplifier with picoamp IB & ENABLE INA190-Q1 AEC-Q100, 40V, bi-directional, ultra-precise current sense amplifier w/picoamp IB & ENABLE INA191 40V, ultra-precise current sense amplifier with ENABLE and picoamp IB in WCSP INA193 -16 to 80V, 500kHz current sense amplifier INA193A-EP Enhanced product, -16 to 80V, 500-kHz current sense amplifier INA193A-Q1 AEC-Q100, -16 to 80V, 500kHz current sense amplifier INA194 -16 to 80V, 500kHz current sense amplifier INA194A-Q1 AEC-Q100, -16 to 80V, 500kHz current sense amplifier INA195 -16 to 80V, 500kHz current sense amplifier INA195A-Q1 AEC-Q100, -16 to 80V, 500kHz current sense amplifier INA196 -16 to 80V, 500kHz current sense amplifier INA196A-Q1 AEC-Q100, -16 to 80V, 500kHz current sense amplifier INA197 -16 to 80V, 500kHz current sense amplifier INA197A-Q1 AEC-Q100, -16 to 80V, 500kHz current sense amplifier INA198 -16 to 80V, 500kHz current sense amplifier INA198A-Q1 AEC-Q100, -16 to 80V, 500kHz current sense amplifier INA199 26V, bi-directional current sense amplifier INA199-Q1 AEC-Q100, 26V, bi-directional current sense amplifier INA200 -16 to 80V, 500kHz current sense amplifier w/ comparator INA200-Q1 AEC-Q100, -16 to 80V, 500kHz current sense amplifier w/ comparator INA201 -16 to 80V, 500kHz current sense amplifier w/ comparator INA201-Q1 AEC-Q100, -16 to 80V, 500kHz current sense amplifier w/ comparator INA202 -16 to 80V, 500kHz current sense amplifier w/ comparator INA202-Q1 AEC-Q100, -16 to 80V, 500kHz current sense amplifier w/ comparator INA203 -16 to 80V, 500kHz current sense amplifier w/ dual comparators INA203-Q1 AEC-Q100, -16 to 80V, 500kHz current sense amplifier w/ dual comparators INA204 -16 to 80V, 500kHz current sense amplifier w/ dual comparators INA205 -16 to 80V, 500kHz current sense amplifier w/ dual comparators INA206 -16 to 80V, 500kHz current sense amplifier w/ window comparator INA207 -16 to 80V, 500kHz current sense amplifier w/ window comparator INA208 -16 to 80V, 500kHz current sense amplifier w/ window comparator INA210 26V, bi-directional, high-precision current sense amplifier INA210-Q1 AEC-Q100, 26V, bi-directional, high-precision current sense amplifier INA211 26V, bi-directional, high-precision current sense amplifier INA211-Q1 AEC-Q100, 26V, bi-directional, high-precision current sense amplifier INA212 26V, bi-directional, high-precision current sense amplifier INA212-Q1 AEC-Q100, 26V, bi-directional, high-precision current sense amplifier INA213 26V, bi-directional, high-precision current sense amplifier INA213-Q1 AEC-Q100, 26V, bi-directional, high-precision current sense amplifier INA214 26V, bi-directional, high-precision current sense amplifier INA214-Q1 AEC-Q100, 26V, bi-directional, high-precision current sense amplifier INA215 26V, bi-directional, high-precision current sense amplifier INA215-Q1 AEC-Q100, 26V, bi-directional, high-precision current sense amplifier INA216 1.8 to 5.5V, high-precision current sense amplifier in wcsp INA2180 26V, dual channel, 350kHz current sense amplifier INA2180-Q1 AEC-Q100, 26V, dual channel, 350kHz current sense amplifier INA2181 26V, dual channel, bi-directional, 350kHz current sense amplifier INA2181-Q1 AEC-Q100, 26V, dual channel, bi-directional, 350kHz current sense amplifier INA2191 40-V, dual-channel, bidirectional, ultraprecise current sense amp w/ picoamp IB & ENABLE in wcsp INA223 26V, programmable-gain current sense amplifier & analog power monitor INA225 36V, bi-directional current sense amplifier w/ four pin-selectable gain settings INA225-Q1 AEC-Q100, 36V, bi-directional current sense amplifier w/ four pin-selectable gain settings INA2290 Dual-channel, 2.7-V to 120-V, 1.1-MHz, ultra-precise current sense amplifier INA240 -4 to 80V, bidirectional, ultra-precise current sense amplifier with enhanced PWM rejection INA240-Q1 AEC-Q100, -4 to 80V, bi-directional, ultra-precise current sense amplifier w/ enhanced pwm rejection INA241A -5-V to 110-V bidirectional ultraprecise current sense amplifier with enhanced PWM rejection INA241A-Q1 AEC-Q100, -4V to 110V bidirectional ultraprecise current sense amplifier with enhanced PWM rejection INA241B -5-V to 110-V bidirectional high-precision current sense amplifier with enhanced PWM rejection INA241B-Q1 AEC-Q100, -4V to 110V bidirectional high-precision current sense amp with enhanced PWM rejection INA270 -16 to 80V, split-stage current sense amplifier w/ in-line filter capability INA270A-Q1 AEC-Q100, -16 to 80V, split-stage current sense amplifier w/ in-line filter capability INA271 -16 to 80V, split-stage current sense amplifier w/ in-line filter capability INA271-HT High temp, -16 to 80V, split-stage current sense amplifier w/ in-line filter capability INA271A-Q1 AEC-Q100, -16 to 80V, split-stage current sense amplifier w/ in-line filter capability INA280 2.7-V to 120-V, 1.1-MHz, high-precision current sense amplifier in small (SC-70) package INA280-Q1 AEC-Q100, 2.7-V to 120-V, 1.1-Mhz current sense amplifier in small (SC-70) package INA281 -4-V to 110-V, 1.3-MHz, high-precision current sense amplifier INA281-Q1 AEC-Q100, -4-V to 110-V, 1.3-MHz current sense amplifier INA282 -14 to 80V, bi-directional current sense amplifier INA282-Q1 AEC-Q100, -14 to 80V, bi-directional current sense amplifier INA283 -14 to 80V, bi-directional current sense amplifier INA283-Q1 AEC-Q100, -14 to 80V, bi-directional current sense amplifier INA284 -14 to 80V, bi-directional current sense amplifier INA284-Q1 AEC-Q100, -14 to 80V, bi-directional current sense amplifier INA285 -14 to 80V, bi-directional current sense amplifier INA285-Q1 AEC-Q100, -14 to 80V, bi-directional current sense amplifier INA286 -14 to 80V, bi-directional current sense amplifier INA286-Q1 AEC-Q100, -14 to 80V, bi-directional current sense amplifier INA290 2.7 to 120V, 1.1MHz, ultra-precise current sense amplifier in small (SC-70) package INA290-Q1 AEC-Q100, 2.7-V to 120-V, 1.1-MHz, ultra-precise current sense amplifier in small (SC-70) package INA293 -4-V to 110-V, 1.3-MHz, ultra-precise current sense amplifier INA293-Q1 AEC-Q100, -4-V to 110-V, 1.3-MHz, ultra-precise current sense amplifier INA296A -5-V to 110-V, bidirectional, 1.1-MHz 8-V/µs ultraprecise current sense amplifier INA296A-Q1 AEC-Q100, -5V to 110V, bidirectional, 1.1-MHz 8-V/µs ultraprecise current sense amplifier INA296B -5-V to 110-V, bidirectional, 1.1-MHz 8-V/µs high-precision current sense amplifier INA296B-Q1 AEC-Q100, -5V to 110V, bidirectional, 1.1-MHz 8-V/µs high-precision current sense amplifier INA300 36V current sense comparator INA300-Q1 AEC-Q100, 36V current sense comparator INA301 36V, 550kHz, 4V/µs, high-precision current sense amplifier w/ comparator INA301-Q1 AEC-Q100, 36V, 550kHz, 4V/µs, high-precision current sense amplifier w/ comparator INA302 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amplifier w/ dual comparators INA302-Q1 AEC-Q100, 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amp w/ dual comparators INA303 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amplifier w/ window comparator INA303-Q1 AEC-Q100, 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amp w/ window comparator INA381 26-V, 350-kHz current sense amplifier with integrated over-current comparator INA381-Q1 AEC-Q100, 26-V, 350-kHz current sense amplifier with integrated overcurrent comparator INA4180 26V, quad channel, 350kHz current sense amplifier INA4180-Q1 AEC-Q100, 26V, quad channel, 350kHz current sense amplifier INA4181 26V, quad channel, bi-directional, 350kHz current sense amplifier INA4181-Q1 AEC-Q100, 26V, quad channel, bi-directional, 350kHz current sense amplifier INA4290 Quad-channel, 120-V, high-voltage, high-bandwidth, unidirectional current sense amplifier INA901-SP Radiation hardened, -15-V to 65-V, split-stage current sense amplifier with in-line filter option LMP8278Q-Q1 AEC-Q100, -2 to 40V, split-stage current sense amplifier w/ in-line filter capability LMP8480 4 to 76V current sense amplifier LMP8480-Q1 AEC-Q100, 4 to 76V current sense amplifier LMP8481 4 to 76V, bi-directional current sense amplifier LMP8481-Q1 AEC-Q100, 4 to 76V, bi-directional current sense amplifier LMP8601 -22 to 60V, bi-directional current sense amplifier w/ in-line filter capability LMP8601-Q1 AEC-Q100, -22 to 60V, bi-directional current sense amplifier w/ in-line filter capability LMP8602 -22 to 60V, bi-directional current sense amplifier w/ in-line filter capability LMP8602-Q1 AEC-Q100, -22 to 60V, bi-directional current sense amplifier w/ in-line filter capability LMP8603 -22 to 60V, bi-directional current sense amplifier w/ in-line filter capability LMP8603-Q1 AEC-Q100, -22 to 60V, bi-directional current sense amplifier w/ in-line filter capability LMP8640 -2 to 42V, 950kHz current sense amplifier LMP8640-Q1 AEC-Q100, -2 to 42V, 950kHz current sense amplifier LMP8640HV -2 to 76V, 950kHz current sense amplifier LMP8645 -2 to 42V, 990kHz, configurable gain current sense amplifier LMP8645HV -2 to 76V, 990kHz, configurable gain current sense amplifier LMP8646 -2 to 76V, configurable gain and bandwidth, high-speed current limiter
Analog current-sense amplifiers with integrated shunt resistor
INA250 36V, bi-directional, precision current sense amplifier w/int. shunt resistor INA250-Q1 AEC-Q100, 36V, bi-directional, precision current sense amplifier w/int. shunt resistor INA253 80V, bi-directional, precision current sense amp w/pwm rejection & int. shunt resistor INA253-Q1 AEC-Q100, 80V, bi-directional, precision current sense amp w/pwm rejection & int. shunt resistor
Digital power monitors
INA209 26V, 12-bit, i2c output current/voltage/power monitor w/ analog comparator INA219 26-V 12-bit I2C output digital power monitor INA220 26V, 12-bit, i2c output current/voltage/power monitor INA220-Q1 AEC-Q100, 26V, 12-bit, i2c output current/voltage/power monitor INA226 36V, 16-bit, ultra-precise i2c output current/voltage/power monitor w/alert INA226-Q1 AEC-Q100, 36V, 16-bit, ultra-precise, i2c output current/voltage/power monitor w/alert INA228 85-V, 20-bit, ultra-precise, I2C output current/voltage/power/energy/charge monitor with alert INA228-Q1 AEC-Q100, 85-V, 20-bit, ultraprecise, I²C output current/voltage/power/energy/charge monitor INA229 85-V, 20-bit, ultra-precise, SPI output current/voltage/power/energy/charge monitor with alert INA229-Q1 AEC-Q100, 85-V, 20-bit, ultraprecise, SPI output current/voltage/power/energy/charge monitor INA230 36-V, 16-bit, I²C output current, voltage and power monitor with alert INA231 28V, 16-bit, i2c output current/voltage/power monitor w/alert in wcsp INA233 36V, 16-bit, ultra-precise i2c & pmbus output current/voltage/power/energy monitor w/alert INA234 28-V, 12-bit, I²C output current/voltage/power monitor with alert in WCSP INA236 48-V, 16-bit ultraprecise I²C output digital power monitor with alert in WCSP INA237 85-V, 16-bit, I2C output current/voltage/power monitor with alert INA237-Q1 AEC-Q100, 85-V, 16-bit, I²C output current/voltage/charge monitor INA238 85-V, 16-bit, high-precision I2C output current/voltage/power monitor with alert INA238-Q1 AEC-Q100, 85-V, 16-bit, high-precision, I²C output current/voltage/charge monitor INA239 85-V, 16-bit, high-precision, SPI output current/voltage/power monitor with alert INA239-Q1 AEC-Q100, 85-V, 16-bit, high-precision, SPI output current/voltage/power monitor INA3221 26V, triple channel, 13-bit, i2c output current/voltage monitor w/alerts INA3221-Q1 AEC-Q100, 26V, triple channel, 13-bit, i2c output current/voltage monitor w/alerts LMP92064 2V, 12-bit, fast simultaneous sampling SPI output current/voltage monitor
Design tool

CIRCUIT060035 — Bidirectional current sensing with a window comparator circuit

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Design tool

CIRCUIT060037 — Precision over-current latch circuit

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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Simulation tool

TINA-TI — SPICE-based analog simulation program

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Reference designs

TIDA-00302 — Current Shunt Monitor with Transient Robustness Reference Design

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Design guide: PDF
Schematic: PDF
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SOT-23-THN (DDC) 6 Ultra Librarian

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